Reamer



e. B. McCRACKEN. REAMER.

ION FILED MAR-16 Patented Oct. 3, 1922.

Patented Oct. 3, 1922.

UNITED STATES.

GEORGE B. MCCRACKEN, OF WILLIMANTIC, CONNECTICUT.

REAMER.

Ap lication filed Harch 1d, 1920. Serial No. 386,293.

T 0 all whom it may concern:

Be it known that I, GEORGE B. Mo- CRACKEN, a citizen of the UnitedStates, and a resident of \Villimantic, in the county of Windham andState of Connecticut, have invented new and Improved Reamers, of whichthe following is a specification.

My invention relates to the class of tools employed for cuttingoperations in holes previously formed and an object of my invention,among others, is to provide a tool of this class that shall be extremelystrong in its constructiton and effective in its op eration.

One form of reamer embodying my invention and in the construction anduse of which the objects herein set out, as well as others, may beattained, is illustrated in the accompanying drawings, in Which Figure 1is a side view of a reamer em= bodying my invention.

Figure 2 is a view in central longitudinal section through the same.

Figure 3 is a view in cross section on plane denoted by dotted line 33of Figure 2.

Figure 4 is a view in cross section on plane denoted by dotted line 4-4:of Fig ure 2.

My improved reamer comprises a body formed with a cylindrical micrometerbearing 5 and an angularly shaped end 6 by means of which the device maybe turned as with a wrench, said body also including a threaded portion7 for a feeding sleeve, a grooved portion 8 for the cutting blades and arounded end 9 having a threaded portion 10 for a locking sleeve 11. Thisbody is formed from a single piece of metal, and the formation thereofis such as to provide an extremely strong device.

Grooves 12 are formed in the side of the body extending lengthwisethereof, and cutters 13 are located in these grooves. The cutters andgrooves are so formed that the edges of the former will be movedradially in the body as they are moved longitudinally in said grooves,in the construction herein shown, the grooves increasing in depth fromone end to the other and the cutters also being wider at one end than atthe other. -The bottoms of the grooves and the backs of the cutters areso formed that the latter rest squarely on the bottoms of the former forthe entire length of the cutters.

All interiorly threaded feeding sleeve 14:

is mounted on the feeding thread 7 on the body, the thread within thesleeve being located at a substantial distance from each end thereof,thereby reducing to a minimum the liability of dirt and grit gainingaccess to said threaded portion and thereby affecting the smooth workingof the parts. As a further safeguard against this entrance of dust anddirt-the sleeve is made to closely fit the body of the reamerbetweensaid thread and the cutters, and it also fits the endsof thecutters, the latter preventing entrance of matter into the grooves 8'underneath the sleeve. As a preventive against the entrance of dust anddirt at-the opposite end of saidv sleeve, the latter is made to closelytit and have a bearing upon a micrometer base 15 that is in thefoi'm ofa sleeve adjustably mounted on the body and secured as by means ofscrews 16. This location of the threads at a substantial distance fromboth ends of the sleeve 14 also prevents any liability to injury ofsuchthreads by forcible contact with other objects, the threads being sopositioned that they will never be exposed in the regular uses intendedfor the device. The feeding end of the sleeve 14 abuts a ainst thecutters, the contacting surfaces of the cutters and sleeve beingpreferably beveled for the purpose of imparting feeding movement to thecutters, and the opposite end of said sleeve is provided with micrometergraduations 17 by means of which the degree of movement of the sleeve,and hence of the cutters, may be determined, a base line 18 on themicrometer base 15 b ing employed to determine the amount of rotationimparted to said sleeve, and the line 18 may have graduations 19extending along its length, if desired, and as shown in Figure 1 of thedrawings. The sleeve 15 may be adjusted to any position so .that thebase line thereon will register with the zero reading of the micrometerscale on the feeding and micrometer sleeve 14:. This combined feedingand micrometer sleeve is extremely long and has a good substantialbearing.

being firmly supported at each end and for substantial part of itsentire length. An interiorly threaded locking sleeve 15 fitted upon thethread 10, these threaded parts also being located well within thesleeve and at a substantial distance from each end thereof, with theadvantages hereinabove set out with respect to the sleeve 14. The end ofthis sleeve abuts against the ends of the cutters and it is employed tolock the cutters in place after they have been positioned by means ofthe feeding sleeve 14, both of said sleeves being undercut to receivethe cutters and retain them in their grooves.

I claim- 1. A cutting implement comprising a body with lengthwisegrooves therein, cutters located in said grooves, a locking sleeve forsaid cutters, and a one piece feeding sleeve for said cutters, saidsleeve having a close contact bearing on its interior surface at eachend thereof and at a substantial distance from each end thereof andfitting a threaded portion of the body, said threaded portion of thebody being of a length sub stantially less than the length of saidsleeve.

2. A cutting implement comprising a body I having lengthwise groovestherein and a feeding thread and a locking thread, cutters located insaid grooves, a one piece feeding sleeve fitting one of said threads onthe body and surrounding and coveringsaid grooves I and having a closecontact bearing on its inlonger than the thread on the body which itfits,.said body projecting through and out at the end of the feedingsleeve and having a bearing for said sleeve which sleeve is of a size toprovide a space between said thread and said bearing.

3. A cutting implement comprising a body having lengthwise groovestherein and a feeding thread and a locking thread, cutters located insaid grooves, a feeding sleeve and a locking sleeve fitting one of saidthreaded parts on the body, said body extending through and out at theend of said feeding sleeve, a base sleeve mounted upon said body andprojecting into the end of the feeding sleeve to form a bearingtherefor, and means for securing the base sleeve in place.

4. A cutting implement comprising a body having lengthwise groovestherein and a locking threadand a feeding thread thereon, cutterslocated in said grooves, a looking sleeve fitting said locking thread, afeeding sleeve fitting said feeding thread and of a length substantiallylonger than said thread, said feeding sleeve having a bearing atone sideof said thread, and a base sleeve projecting into the feeding sleeve onthe opposite side of said thread, said base sleeve forming a bearing forone end of the feeding sleeve.

GEORGE B. MQCRACKEN.

